What does the shading around some 48 series keys indicate?

[Csaba Tizedes]

(04-18-2020 05:39 PM)Orome Wrote:  What is the reason for the shading around the digit and right shift keys on the 48G, 48GX, and 48G+?

I suggest study the 48SX and HP32SII "era" of HP, these two calculators which was the first in some fields and they had a clear idea behind these things.

I prefer the SX version because not included the user interface things which are too slow on the GX machines. In the SX manuals and 32SII manuals you can find some information:

   

Cs.